Answer 1:
There are many ideas but nothing proved about
these basic questions. If one accepts the
multiverse idea, there is no way to go from one to
the other without going through a singularity and
that is impossible. Here is some info from
wikipedia: The multiverse (or
meta-universe) is the hypothetical set of multiple
possible universes (including the historical
universe we experience) that together comprise
everything that exists: the entirety of space,
time, matter, and energy as well as the physical
laws and constants that describe them. The term
was coined in 1895 by the American philosopher and
psychologist William James. The various universes
within the multiverse are sometimes called
parallel universes. Tegmark's
classification
Cosmologist Max Tegmark has
provided a taxonomy of universes beyond the
familiar observable universe. The levels according
to Tegmark's classification are arranged such that
subsequent levels can be understood to encompass
and expand upon previous levels, and they are
briefly described below. Level I:
Beyond our cosmological horizonA generic
prediction of chaotic inflation is an infinite
ergodic universe, which, being infinite, must
contain Hubble volumes realizing all initial
conditions. Accordingly, an infinite
universe will contain an infinite number of Hubble
volumes, all having the same physical laws and
physical constants. In regard to configurations
such as the distribution of matter, almost all
will differ from our Hubble volume. However,
because there are infinitely many, far beyond the
cosmological horizon, there will eventually be
Hubble volumes with similar, and even identical,
configurations. Tegmark estimates that an
identical volume to ours should be about ten to
the ten to the 115 meters away from us (a number
larger than a googolplex). By the cosmological
principle, one assumes our Hubble volume is not
special or unique. Level II:
Universes with different physical
constants "Bubble universes", every disk is
a bubble universe (Universe 1 to Universe 6 are
different bubbles, they have physical constants
that are different from our universe), our
universe is just one of the bubbles. In the
chaotic inflation theory, a variant of the cosmic
inflation theory, the multiverse as a whole is
stretching and will continue doing so forever, but
some regions of space stop stretching and form
distinct bubbles, like gas pockets in a loaf of
rising bread. Such bubbles are embryonic level I
multiverses. Linde and Vanchurin calculated the
number of these universes to be on the scale of
101010000000.Different bubbles may experience
different spontaneous symmetry breaking resulting
in different properties such as different physical
constants.[4] This level also includes John
Archibald Wheeler's oscillatory universe theory
and Lee Smolin's fecund universes
theory. Level III: Many-worlds
interpretation of quantum mechanicsHugh Everett's
many-worlds interpretation (MWI) is one of several
mainstream interpretations of quantum mechanics.
In brief, one aspect of quantum mechanics is that
certain observations cannot be predicted
absolutely. Instead, there is a range of possible
observations each with a different probability.
According to the MWI, each of these possible
observations corresponds to a different universe.
Suppose a die is thrown that contains six sides
and that the result corresponds to a quantum
mechanics observable. All six possible ways the
die can fall correspond to six different
universes. (More correctly, in MWI there is only a
single universe but after the "split" into "many
worlds" these cannot in general
interact.)[7]Tegmark argues that a level III
multiverse does not contain more possibilities in
the Hubble volume than a level I-II multiverse. In
effect, all the different "worlds" created by
"splits" in a level III multiverse with the same
physical constants can be found in some Hubble
volume in a level I multiverse. Tegmark writes
that "The only difference between Level I and
Level III is where your doppel gangers reside. In
Level I they live elsewhere in good old
three-dimensional space. In Level III they live on
another quantum branch in infinite-dimensional
Hilbert space." Similarly, all level II bubble
universes with different physical constants can in
effect be found as "worlds" created by "splits" at
the moment of spontaneous symmetry breaking in a
level III multiverse.[4] Related to the
many-worlds idea are Richard Feynman's multiple
histories interpretation and H. Dieter Zeh's
many-minds interpretation. Level IV:
Ultimate Ensemble The Ultimate Ensemble hypothesis
of Tegmark himself. This level considers equally
real all universes that can be described by
different mathematical structures. This does not
include different low-energy physical laws not of
our observable universe. Tegmark writes that
"abstract mathematics is so general that any
Theory Of Everything (
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